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PDF MH88625 Data sheet ( Hoja de datos )
| Número de pieza | MH88625 | |
| Descripción | DID/OPS SLIC Preliminary Information | |
| Fabricantes | Mitel Networks | |
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MH88625
®
DID/OPS SLIC
Preliminary Information
Features
• Programmable gain, network balance and
impedance
• Transformerless 2-4 wire conversion
• Constant current with constant voltage fallback
for long loop capability
• Pin compatible with MH88632 and MH88628
• Unbalance detection (Tip, Ring ground sensing)
• Auto ring trip
• On-Hook transmission (ANI) capability
• Compatible with requirements of CCITT,
DOC/FCC and CSA/UL
• Excellent power dissipation (SIL vertical
mounting)
• 12/16kHz meter pulse injection control
• Solid State TIP/RING reversals
ISSUE 6
April 1995
Ordering Information
MH88625
40 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88625 SLIC provides all of the
functions required to interface 2-wire off premise
subscriber loops to a serial TDM, PCM, switching
network of a modern PBX. The MH88625 is
manufactured using thick-film hybrid technology
which offers high voltage capability, reliability and
high density resulting in significant printed circuit
board area savings. A complete line card can be
implemented with very few external components.
Applications
• On/Off Premise PBX Line Cards
• DID (Direct Inward Dial) Line Cards
• Central Office Line Cards
RING
RF1
RF2
TIP
TF1
TF2
UD
RNGC
RGND
VRLY
VBat LGND
LCA VDD VEE
AGND
Matched
Feed
Resistors
Unbalance
Detection
Driver
Circuitry
And
Speech
Circuit
Ring
Relay
Driver
Tip/Ring
Reversal
External
Signal
Input
Loop
Current
Set
Switch-hook
Threshold Set
Switch-hook
Detect
Ring
Filter
Impedance
Network
2-4 Wire
Conversion
Gain Adjust
SHK
NS
N1
N2
NATT
RRD
REVC ESI ESE Z900 Z600 Z1 Z2 GRX1 GRX0 RX GTX1 GTX0 TX
FIgure 1 - Functional Block Diagram
2-183
1 page  
Preliminary Information
MH88625
AC Electrical Characteristics‡
Characteristics
1 TX Gain
2 RX Gain
3 Ringing Capability
4 On-Hook Transmission
Signal Input Level
Gain
5 External Signal Output Level
Sym
6 SHK Rise Time
Fall time
7 2-Wire Termination
Impedance
8 Off-Hook Detect Threshold
9 2-Wire Return Loss
tR
tF
10 Longitudinal Balance
Longitundinal to Metallic
Metallic to Longitudinal
11 Longitudinal Current
Capability
12 Idle channel Noise
Rx to T-R
T-R to Tx
13 Transhybrid Loss
14 Unbalanced Detect Threshold
15 Analog Signal Overload Level
at Tip and Ring
16 Ringing Signal Voltage
NCR
NCX
THL
IUB
Min Typ* Max Units
Test Conditions
0 dB externally adjustable
0 dB externally adjustable
5 REN
2.0
6
1.75 2.25
1
1
600/
900
10
20
20
20
Vrms
dB
VBat=-48V
T-R load = 10kΩ min.
Vrms
VBat= -48V, T-R load=
200Ω LCA=0V, Zo-600Ω,
Gain=0dB
ms Dial Pulse Detection
ms
Ω
Selectable
mA
dB 300 to 500Hz
dB 500 to 2500Hz
dB 2500 to 3400Hz
58 dB 200-1000Hz
53 dB 3400Hz
40 mA 20mA per lead
8
12
22 40
10
dBrnC
dBrnC
dB
mA
200-3400Hz
4 dBm T-R=600Ω, VBat=-48V
90 Vrms
17 Ringing Frequency
17 33 Hz
18 Ring Trip Delay
100 ms
19 Absolute Gain, Variation
+0.1
dB 0dB at T-R, 1kHz
20 Relative Gain, reference to
1kHz
+0.05
dB 300-3400Hz
21 Power supply Rejection Ratio PSRR
dB 1kHz, 100mVpp
VBat
VDD
VEE
24
24
24
‡ AC Electrical Characteristics are over recommended operating conditions unless otherwise stated.
* Typical figure are at 25°C with nominal +5V supplies and are for design aid only.
Notes: Impedance set by external network of 600Ω or 900Ω default.
External network for test purposes consists of 2200Ω + 8200Ω // 11.5nF between pins Z1 and Z2, the equivalent Zin has 1/10th
the impedance and is equivalent o 220Ω+820Ω // 115nF.
Test condition uses a Zin value of 600Ω, 900Ω and the above external network.
Test conditions use a transmit and receive gain set to 0dB default and a Zin value of 600Ω unless otherwise stated.
“Ref” indicates reference impedance which is equivalent to the termination impedance.
“Net” indicates network balance impedance.
Refer to Table 1, 2 for TX, RX gain adjustment.
2-187
5 Page 
Preliminary Information
MH88625
Tables 1 & 2: Transmit and Receive Gain Programming
Transmit
Gain (dB)
RTX Resistor
Value (Ω)
Notes
+6.0
+4.0
+3.7
0.0
-3.0
-6.0
-12.0
No Resistor
38.3k
32.4k
GTX0 to GTX1
5.49k
3.32k
1.43k
Results in 0dB overall gain when used with Mitel A-law codec (i.e.
MT8965)
Results in 0dB overall gain when used with Mitel µ-law codec (i.e.
MT8964)
Receive Gain
(dB)
RRX Resistor
Value (Ω)
Notes
+6.0
0.0
-3.0
-3.7
-4.0
No Resistor
GRX0 to GRX1
5.49k
4.87k
4.64k
Results in 0dB overall gain when used with Mitel A-law codec (i.e.
MT8965)
Results in 0dB overall gain when used with Mitel µ-law codec (i.e.
MT8964)
-6.0 3.32k
-12.0
1.43k
Note 1: See Figures 3 and 4 for additional details.
Note 2: Overall gain refers to the receive path of PCM to 2-wire, and transmit path of 2-wire to PCM.
Table 3: Input Impedance Settings
Z2
Z1
Z600
Z900
Resulting input impedance (Zin)
NA Connect Z1 to Z600 NA
600Ω
NA Connect Z1 to
Z900
NA Connect Z1 to
Z900
900Ω
Connect network from Z1 to Z2
NA
NA 0.1 x impedance between Z1 & Z2
Note 1: NA indicates high impedance (10kΩ) connection to this pin does not effect the resulting network balance.
Note 2: See Figure 4 & 5 for Applications Circuits.
Table 4: Network Balance Settings.
NS (Input)
N2
Low NA
High
NA
N1 NATT
NA NA
Connect N1 to NATT
High
Connect network from N1 to
AGND equivalent to 10 x
NETBAL. Connect network
from N1 to N2 equivalent to 10
x Zin.
NA
Resulting input impedance (Zin)
Equivalent to Zin
AT&T compromise (350Ω + 1kΩ //
210nF)
Zin must be 600Ω
0.1 x impedance between N1 & N2
Note 1: NA indicates high impedance (10kΩ) connection to this pin does not effect the resulting network balance.
Note 2:Low indicates Logic Low.
Note 3: See Figures 6 and 7 for Application Circuit.
2-193
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MH88625.PDF ] | |
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